Certain IP blocks are allowed to access certain smtp servers and send
an email through them.
Could i have a list of such ip blocks and the server they are allowed to access?
(for example, comcast users might be allowed to access comcast's smtp server)

Quick answer = large tip.

Regards.

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Request for Question Clarification by nenna-ga on 12 Nov 2004 09:37 PST

Hello,

Could you tell us the context of the question? 

Nenna-GA
Google Answers Researcher

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Clarification of Question by modena-ga on 13 Nov 2004 04:31 PST

While i am not allowed to divulge the exact reason asto why this
information is needed by me, i can assure you it has nothing to do
with spam.
It does have something to do with email marketing (i.e newsletters,
optin emails etc).
Thats all im allowed to say.

Regards.

you wouldn't be wanting this list to conduct spamming activities i hope

The SMTP addresses of a specific service provider may be found by
performing an NSLOOKUP of the domain name (nslookup -querytype=MX
domain.com).

The blocks of addresses used by a specific service provider (COMCAST
per your example) may be found by going to the American registry of
internet numbers (ARIN) at www.arin.net, and entering the name
(COMCAST) in the WHOIS field near the top left of page.

The other current registries are APNIC (Asia Pacific), LACNIC (Latin
America and Caribbean, and RIPE (Europe, North Africa, some Asia).